chore(package): update script-ext-html-webpack-plugin to version 2.1.4

Closes #558

Author: greenkeeper[bot]

package.json

@@ -160,7 +160,7 @@
     "raw-loader": "0.5.1",
     "rimraf": "^2.6.1",
     "sass-loader": "^6.0.0",
-    "script-ext-html-webpack-plugin": "^1.6.2",
+    "script-ext-html-webpack-plugin": "^2.1.4",
     "source-map-loader": "^0.2.1",
     "string-replace-loader": "^1.2.0",
     "style-loader": "^0.19.0",